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IQS128 데이터시트, 핀배열, 회로
IQ Switch® ProxSense® Series
IQS128 / IQS128L Datasheet
IQ Switch® - ProxSense® Series
Single Channel Capacitive Proximity/Touch Controller
The IQS128 / IQS128L ProxSense® IC is a fully integrated capacitive sensor implementing
Dynamic Calibration (DYCAL™) technology: intelligent hysteresis to allow for sensor drift even
during sensor activation.
Features
IQS128 TSOT23-6
DYCAL™ : Intelligent Hysteresis
Internal Capacitor Implementation (ICI) reference
capacitor on-chip
Automatic Tuning Implementation (ATI) -
IQS128L DFN8 (2x3)
Automatic adjustment for optimal sensor performance
Supply voltage: 2.95V to 5.5V
Minimum external components
1-Wire open drain data streaming option
Advanced on-chip digital signal processing
User selectable (OTP):
External synchronisation control or
External control over filter operation
I/O Sink or Source selection
Time-out for stuck key
Proximity and Touch sensitivity selections
IQS128L: Low Power options available
Keys:
Dielectric:
Touch:
Proximity:
Material:
Thickness:
5mm x 5mm or larger (overlay thickness dependent)
Various electrical options (wire / PCB trace / ITO / conductive foil)
Various non-metal materials (i.e. glass, plastic, painted surfaces)
6 mm plastic, 10 mm glass for touch. Very thick overlay possible for proximity
Applications
Occupancy sensors
SAR qualification for Tablet PC’s
On-ear detection for mobile phones
3D glasses
Personal Media Players
White goods and appliances
Advantages
Allows for sensor drift in periods of
activation and non-activation
Improved digital filtering to reduce
external noise
Human Interface Devices
Proximity activated backlighting
Any applications where a touch and
proximity condition can prevail for an
extended period of time with or
without a host controller
Minimal power consumption (<7µA)
when in standby mode (Charge Halt).
Available Options
TA
-40°C to 85°C
TSOT23-6
IQS128
DFN8 (2x3)
IQS128L
Copyright © Azoteq (Pty) Ltd 2011
All Rights Reserved
IQS128 & IQS128LP Datasheet v2.4
Page 1 of 33
November 2012
Free Datasheet http://www.datasheet4u.com/




IQS128 pdf, 반도체, 판매, 대치품
IQ Switch® ProxSense® Series
1 Overview
1.1 Device variations
Functionality
Device
Package
Release
Threshold
DYCAL
Filter
operation
Block
ATI
LP
modes
RF Noise
Detection
Pulse on
CTRL
(Input)
DYCAL
Output
ATI Touch
Base Debounce
IQS128 TSOT23-6
75%
Normal
-
-
Available
Reseed
TOUT
4
values
3
IQS128L DFN8(2x3)
75% &
87.5%
Updated
3sec
after
exiting
TM
4 Power
Modes
-
Re-ATI
POUT
or
TOUT
8
values
2
Please note: Except for the functional variations stated above, there also exist differences
between the proximity and touch thresholds for the IQS128L version. More on this in Sections
6.4 & 6.5.
1.2 Device
The IQS128 and IQS128L ICs will be
referred to as IQS128/IQS128L throughout
the datasheet, unless they have different
functionality, where it will be explicitly
stated and explained.
The IQS128/IQS128L is a single channel
capacitive proximity and touch device which
employs an internal voltage regulator and
reference capacitor (Cs).
The IQS128/IQS128L device has a
dedicated pin for the connection of a sense
electrode (Cx) and output pin for proximity
and touch events on OUT. The polarity of
the output pins can be configured. A 1-wire
open drain data streaming protocol is
implemented for debugging purposes.
Special device configuration can be done
by setting one time programmable (OTP)
options.
The device automatically tracks slow
varying environmental changes via various
signal processing algorithms and has an
Automatic Tuning Implementation (ATI)
algorithm to calibrate the device to the
sense electrode.
DYCAL™ (Dynamic Calibration) is a
special form of hysteresis that can track
slow varying environmental change even
while the sensor is in a touch state.
The charge transfer method of capacitive
sensing is employed on the
IQS128/IQS128L. (The charge transfer
principle is thoroughly described in the
application note: “AZD004 - Azoteq
Capacitive Sensing”.)
1.3 Operation
The device has been designed to be used
in applications where proximity is required
and touch conditions can prevail for an
extended period of time which may result in
uncompensated drift in conventional
capacitive sensors.
A low threshold is used to detect the
proximity of an object, with a higher
threshold for touch detection.
Dynamic Calibration is performed when a
TOUCH condition is detected for longer
than TDYNACAL. The hysteresis algorithm will
now check for the release condition of the
touch, while still tracking environmental
changes
1.4 Applicability
All specifications, except where specifically
mentioned otherwise, provided by this
datasheet are applicable to the following
ranges:
Temperature:-40C to +85C
Supply voltage (VDDHI): 2.95V to 5.5V
Copyright © Azoteq (Pty) Ltd 2011
All Rights Reserved
IQS128 & IQS128LP Datasheet v2.4
Page 4 of 33
November 2012
Free Datasheet http://www.datasheet4u.com/

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IQS128 전자부품, 판매, 대치품
IQ Switch® ProxSense® Series
3 User Configurable
Options
Table 4.1 and Table 4.2 list the user
configurable settings.
The device is fully functional in its default
state, but some applications may require
alternative configuration settings. These
settings are enabled by configuring One
Time Programmable (OTP) user options.
Configuration can be done on packaged
devices or in-circuit. In-circuit configuration
may be limited by values of external
components chosen.
Popular configurations are available ex-
stock please check with the local
distributor for availability. Azoteq can
supply pre-configured devices for large
quantities.
3.1 Configuring Devices
Azoteq offers a Configuration Tool (CTxxx)
and accompanying software
(USBProg.exe) that can be used to
program the OTP user options for
prototyping purposes. More details
regarding the configuration of the device
with the USBProg program is explained by
application note: AZD007 USBProg
Overviewwhich can be found on the
Azoteq website.
Alternative programming solutions for the
IQS128/IQS128L also exist. For further
enquiries regarding this, please contact
or the local distributor.
3.1.1 IQS128 User Selectable Options
Table 3-1: IQS128
Bank 0 User Selectable Options
Bit 7 6 5 4 3 2
Name
Default
TTHR2
0
TTHR1
0
TTHR0
0
PTHR1
0
PTHR0
0
ND
0
bit 7-5
TTHR<2:0>: Touch Thresholds (counts)
000 = 16
001 = 40
010 = 60
011 = 90
100 = 130
101 = 200
110 = 340
111 = 500
10
LOGIC
EXT_CTRL
00
-Section 6.5
bit 4-3
PTHR<1:0>: Proximity Thresholds (counts)
00 = 4
01 = 8
10 = 12
11 = 16
-Section 0
bit 2 ND: RF Noise Detection
0 = Disable RF Noise Detect
1 = Enable RF Noise Detect
-Section 6.3.1
bit 1 LOGIC: Output logic select (Only when STREAMING mode is disabled) -Section 6.7
0 = 1Software Open Drain Active Low
1 = Active High
bit 0 EXT_CTRL: Selects external control option on OUT
0 = Charge Halt
1 = Halt LTA filter
-Section 6.1
1 Only applicable for OUT pin. If CTRL is configured as output, it is a push-pull output.
Copyright © Azoteq (Pty) Ltd 2011
All Rights Reserved
IQS128 & IQS128LP Datasheet v2.4
Page 7 of 33
November 2012
Free Datasheet http://www.datasheet4u.com/

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